Semitool to Announce Second Quarter Financial Results on Tuesday, April 28, 2009

KALISPELL, MT--(Marketwire - April 16, 2009) - Semitool, Inc. (NASDAQ: SMTL), a leading manufacturer of wafer processing equipment for the semiconductor industry, today announced it will issue its second quarter financial results after the stock market closes on Tuesday, April 28, 2009.

Following the release of its financial results, the company will host a conference call and simultaneous webcast. The call will begin at 5 p.m. Eastern and will be accessible by dialing 877-356-3834 (706-679-0445 for international callers) and entering the passcode 95484373.

An audio replay will be accessible approximately two hours after the call has ended and will be available until 11:59 p.m. Eastern on April 30, 2009. The replay can be accessed by dialing 800-642-1687 (706-645-9291 for international callers) and entering the passcode 95484373.

The webcast will be available via the Internet at www.semitool.com. Webcast participants should access the website at least 10 minutes early to register and download any necessary audio software. A replay of the webcast will be available for 90 days.

About Semitool, Inc.

Semitool designs, manufactures and supports highly engineered, multi-chamber single-wafer and batch wet chemical processing equipment used in the fabrication of semiconductor devices. The company's primary suites of equipment include electrochemical deposition systems for electroplating copper, gold, solder and other metals; surface preparation systems for cleaning, stripping and etching silicon wafers; and wafer transport container cleaning systems. The company's equipment is used in semiconductor fabrication front-end and back-end processes, including wafer-level packaging.

Headquartered in Kalispell, Montana, Semitool maintains sales and support centers in the United States, Europe and Asia. The company's stock trades on Nasdaq under the symbol SMTL. For more information, please visit the company's website at www.semitool.com.

Semitool is a registered trademark of Semitool, Inc.

Contact Information: Contacts: Semitool, Inc. Larry Viano Chief Financial Officer 406-752-2107 Pfeiffer High Investor Relations, Inc. Geoff High 303-393-7044